Valve



H. F. NILES.

VALVE.

APPLICATION FILED IuNE I2. 1919.

Patented May 4, 1920..I

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El) STATES PATENT OFFICE.

HARRY F. MILES, 0F CHICAGO, ILLNOS, ASSIGNOR OF ONE-THIRD T0 EVA A.

SCHLICK, 0F COOK COUNTY, 'ILLINOIS.

VALVE.

lessees.-

Speccaton of Letters Patent.

Patented May 4, 1920.

Application filed June 12, 1919. Serial No. 303,743.

some lateral -displacement of its stem with-` out disturbing its seating` relation with its associated port.

Another obiect is to improve the structure disclosed in my Letters Patent of the United No. 1,282,919 granted to me October 18.

ther, further and more specific objects of my invention will become readily appar' to persons skilled in the art, from a cen-- sideration of the following description whel taken in conjunction with the drawings, wherein- Figure l is a central vertical section of a valve showing a part of an engine structure containing a conduit and a valve port.

Fig. 2 is a section taken on line 2-2 of Fig. 1.

ln both views the same reference characters are employed to indicate similar parts.

Valves of the puppet type consist, generally, of a disk having an angularly disposed rim all7 ling a seating surface, in coperation with a similar surface surrounding a port adapted to be closed and opened by the valve.

iucll valves are provided with a centr l i205) i 'lion/eil stein, perpendicular to the the disk, and 'this stein is guided rigidly by means that permits free vertical movement of the valve but which holds the valve, otherwise, in rigid relation with its port. Any lateral displacement of the stem, due to wear of the stem or its guide, permits the valve to cock up on one edge or the other of its seat, leaving relatively large free surfaces of the seat eioosed upon which carbon is deposited, thereafter preventing elfective closing of the port and causing loss of compression in the cylinders of the engine.

ln my former patent the valve was made in the form of a globe or a segment of a globe and from the same radial point, or globe axis, a globular guide surface was described, upon which was seated and around which was movable the guide for the valve stern,

lave found, from practice, that while such anarrangenient is practical and oper- "ive when new, that any unequal wear of tue guide or the valve will disturb their mutual cooperation to some extent and such an arrangement does not contribute, to as large an extent, toward bringing the valve stern back to its former vertical position when it has been once laterally displaced. l therefore provide aliat surface "el-av* the valve which has a tendency of itself to bring the valve back into its normal position and which is arranged to cooperate with the valve at all times independently of any relative wearing away of the parts.

ln the disclosure of my invention, as eX- einplilied by the drawings, l'liave shown a conventional structure in which 5 isa frame containing a conduit or gas passage G and closed by walls 7 7. ln the wall 7 is a valve port 8A having a valve seating surface curved to conform with the seating surface of the valve, The valve 9 has a seating sur- :ace 1G conforming in outline with that of a lglobe, the axis of which would be at the saine point as that from which the port seatig surface was described, or in other words, ic curve of the valve seat and the port seat are struck from the same axial point and of substantially equal radius.

rlhe valve stem 13, of the valve, is not rigidly guided and permitted to move only in vertical plane, as in usual practice The stem is surrounded by a sleeve -14 having a laterally extending head 15, which bears against the under side of the sliding plate 11 through which the valve stem passes and which is laterally movable upon the flat surface 11 with which the plate is in Contact, and which is the lower surface of the wall 17.

New it is evident that when the lower end of the valve stem is Inoved laterally, to a slight extent, that the valve 9 will not leave its seat, although there may be change of contacting surfaces. While this movement may occur the plate 11 will be moved laterally on its confronting flat surface without being moved axially and the spring 19, which seats the valve, will tend to move the plate back into its former position.

The open spiral spring 19 surrounds the valve stem 13 and bears against the head 15 on the sleeve 14. The head being immediately in contact with the plate 11 yieldingly holds the plate in Contact with the lower surface 1l of the-Wall 17. The other end of the spring bears against the vvasher 2O that affords an abutment therefor, and which is held in place on the stem' by the pin 21. The spring yieldingly holds the valve closed in Whatever position it may be, with reference to its contacting surface with its underlying seat, and it also yieldingly holds the plate il in contact with the surface 11 and serves as a means for automatically bringing the stem back in a true vertical position when it has been once deflected therefrom. The valve-moving stem 23 is arranged, axially, With the valve 13, and has its confronting end concaved, as at 24, to assist in bringing the tivo stems in true alinement when the valve is being opened. This effect is augmented by the operation of the plate ll upon its seat 1l in cooperation with the spring. A cam 24 on a shaft 25 tends to vertically move the valve to open position, which is closed by the operation of the spring When the cam is moved substantially a half revolution.

Having described my invention, What I claim is l. A valve structure having in combinative association, a puppet valve With a stem, and a head provided with a globe-like seating surface; a Wall, having a port with a operating surface, whereupon to seat the valve; another wall spaced away from the port Wall having an opening to permit some lateral movement of the valve stem ahd through which the valve stem passes and having a flat 4surrounding surface; a flat plate surrounding the valve stem and in contact with said flat Wall, and a spring to close the valve and bearing on said plate to yieldingly hold it in Contact with said surface.

2. A valve structure having in comb-inative association, a puppet valve with a stem, and a head provided with a globe-like seating surface; a wall having a port with a cooperating surface, whereupon to seat the valve; another wall spaced apart from the nort Wall having' an opening to permit some `hrough which the valve stem passes and `aving a fiat surrounding surface; a flat plate surrounding the valve stem and in contact with said flat Wall surface; a sleeve axially movable on said stem 'having a head closing the opening in said plate and a spring surrounding the stem to close the valve and to seatthe head of the sleeve in the opening in the plate.

ln testimony whereof I hereunto subscribe my name.

' HARRY F. NILES.

ateral movement of the valve `stem and 

